Premiership · Saturday, 17 October 2026 · 15:00. Final score 3–1 (half-time 1–1). Before kick-off we rated it 55% under 2.5 goals — the match finished with 4, so that call missed. That rating was frozen into a version-controlled ledger before the game and has not been touched since.
Open this match in the app →| Market | Yes | No | Our call |
|---|---|---|---|
| Over 2.5 goals | 45% | 55% | Under |
| Over 3.5 goals | 24% | 76% | no pick |
| Both teams to score | 48% | 52% | No |
The result model puts Aberdeen at 45%, the draw at 29% and ST Mirren at 25%, from expected goals of 1.28 and 0.88.
| Market | Price | Implied | Our rating | Edge |
|---|---|---|---|---|
| Over 2.5 goals | 1.80 | 53% | 45% | -8% |
| Under 2.5 goals | 2.00 | 47% | 55% | +8% |
| Both teams to score | 1.70 | 55% | 48% | -7% |
Implied percentages have the bookmaker's margin removed, so they add to 100 and can be compared with our rating directly. Edge is simply the gap between the two. A positive edge means our model thinks the outcome is likelier than the price suggests — it is not a tip, and a high probability with a negative edge is a poor bet however safe it looks. Prices are a pre-match snapshot from a single bookmaker and move constantly.
Match odds: Aberdeen 1.75, draw 3.80, ST Mirren 4.33.
The league sets the starting point. Premiership has produced over 2.5 goals in 53% of its matches, and that is where a team with no record of its own would sit.
Each side's own record. Aberdeen have 3 in 8 this season (1 of 4 at home), ST Mirren 4 in 8 (1 of 4 away). Those records are pulled toward the league rate with the weight of about 24 matches — enough that two or three unusual games cannot swing a rating — giving 49% and 52%.
Last season still counts, briefly. With 8 and 8 games played this season, last season's rates are still blended in and fade out entirely by game 40 — the point at which our testing showed they stop adding accuracy. A single season is part luck, so each club's record is first pulled toward the league average by 34 games' weight. That moves the two figures to 44% and 43%.
The mix. Weighted 40% home side, 40% away side and 20% league — the split that beat every alternative across 30,582 matches of testing — that gives 45%.
Head to head. These sides have met 10 times in three years, producing over 2.5 goals in 60%. That nudges the number 5% of the way toward the head-to-head pattern — deliberately small, because fixtures change more than reputations do — landing on 46%.
Goal expectation. Separately a Poisson model built from attack and defence strength — using real expected-goals data where the league has it — puts this match at 37%, from expected goals of 1.28 for Aberdeen and 0.88 for ST Mirren. Folding in 30% of that view gives 43%.
Calibration. Tested against 97,729 past matches, our ratings below 55% have run consistently too pessimistic — a figure in the high 30s, for instance, has come in about four points higher. So ratings in that range are lifted part-way back, giving 45%.
This breakdown is generated from the same inputs the rating uses, so it cannot describe a calculation we did not perform. The full model is set out in the methodology.
More: Aberdeen season stats · ST Mirren season stats · Premiership table and form. Ratings are calibrated probabilities, not tips — a 60% call is expected to miss two times in five.